Every June 21st, the village of Nortadane must sacrifice one human to the Monsters that live in the dark woods surrounding them. If they fail, the Monsters will raid the village and kill everyone and everything in it. This year when the elders of the village draw the name, it's Ocean's turn to be sacrificed. However, when Ocean steps into the darkness, will she be consumed by the Monsters? Or will she enter a dark world where the Highest Monster desires her heart above her blood?